diff --git a/packages/spec/package.json b/packages/spec/package.json
index 2a466c7..ed5cda8 100644
--- a/packages/spec/package.json
+++ b/packages/spec/package.json
@@ -37,7 +37,7 @@
     "zod-to-json-schema": "^3.25.1"
   },
   "dependencies": {
-    "zod": "^3.22.4"
+    "zod": "^4.3.5"
   },
   "engines": {
     "node": ">=18.0.0"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index f413a8a..fc6ac7d 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -239,8 +239,8 @@ importers:
   packages/spec:
     dependencies:
       zod:
-        specifier: ^3.22.4
-        version: 3.25.76
+        specifier: ^4.3.5
+        version: 4.3.5
     devDependencies:
       '@types/node':
         specifier: ^20.10.0
@@ -259,7 +259,7 @@ importers:
         version: 2.1.9(@types/node@20.19.30)(lightningcss@1.30.2)
       zod-to-json-schema:
         specifier: ^3.25.1
-        version: 3.25.1(zod@3.25.76)
+        version: 3.25.1(zod@4.3.5)
 
   packages/types:
     dependencies:
@@ -3333,9 +3333,6 @@ packages:
     peerDependencies:
       zod: ^3.25 || ^4
 
-  zod@3.25.76:
-    resolution: {integrity: sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==}
-
   zod@4.3.5:
     resolution: {integrity: sha512-k7Nwx6vuWx1IJ9Bjuf4Zt1PEllcwe7cls3VNzm4CQ1/hgtFUK2bRNG3rvnpPUhFjmqJKAKtjV576KnUkHocg/g==}
 
@@ -6650,11 +6647,9 @@ snapshots:
 
   yocto-queue@1.2.2: {}
 
-  zod-to-json-schema@3.25.1(zod@3.25.76):
+  zod-to-json-schema@3.25.1(zod@4.3.5):
     dependencies:
-      zod: 3.25.76
-
-  zod@3.25.76: {}
+      zod: 4.3.5
 
   zod@4.3.5: {}